Ditto what LDog said. I never shot the 300 mag in a Savage but my 3 rifles are tack drivers with good groups which only got better when I started working on handloads. With my current generation of handloads in my 12FV and Accutrigger, I am getting 0.5" @ 100 yards, my 110 LA and 10 SA which are both non-accutrigger, are still works in progress on the handloads but the factory loads I use group 1" or less.
Safe shooting.